8143697521 has 16 divisors (see below), whose sum is σ = 8811835200. Its totient is φ = 7499884608.

The previous prime is 8143697519. The next prime is 8143697557. The reversal of 8143697521 is 1257963418.

It is not a de Polignac number, because 8143697521 - 2¹ = 8143697519 is a prime.

Its product of digits (362880) is a multiple of the sum of its prime divisors (10368).

It is not an unprimeable number, because it can be changed into a prime (8143697501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 897435 + ... + 906463.

It is an arithmetic number, because the mean of its divisors is an integer number (550739700).

Almost surely, 2^8143697521 is an apocalyptic number.

It is an amenable number.

8143697521 is a deficient number, since it is larger than the sum of its proper divisors (668137679).

8143697521 is a wasteful number, since it uses less digits than its factorization.

8143697521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10368.

The product of its digits is 362880, while the sum is 46.

The square root of 8143697521 is about 90242.4374726215. The cubic root of 8143697521 is about 2011.9038025940.

The spelling of 8143697521 in words is "eight billion, one hundred forty-three million, six hundred ninety-seven thousand, five hundred twenty-one".